(57) The disclosure relates to optical measurement apparatus for determining a plurality
of dimensions of an object at linearly spaced locations on the object, comprising
a measurement station for measurement of a linear dimension of the object, means to
move the object through the measurement station to present the locations to be measured
one by one, a light source (3) on one side of the measurement station to direct a
beam of light at the location of the object (1) in the measuring station transversely
to the required line of measurement and to the path of movement of the object through
the station, elongate photo-electric array means (14,15) disposed on the opposite
side of the measurement station to the light source and lens means (6, 7) to focus
an image of the part of the object to be measured on the photo-electric array means
to form an image thereon of said part of the object. An elongate measurement graticule
(39) is provided on which a scale is delineated and means (38) are provided for directing
collimated light through the graticule and thence into the lens system to be focused
on to the photo-electric array means whether or not an object is present in the apparatus
for calibration of the array means prior to or during a cycle of measurement of an
object.
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